﻿<div class="easyui-panel" data-options="fit:true" style="padding:25px;">
    <input id="t1" type="text" class="easyui-numberbox" value="123" style="font-size:14px;" />
</div>

<script>
    $(function () {
        var t1 = $("#t1");
        var span = t1.next();
        var t2 = span.children("input");
        t2.css({ "font-size": "17px" });
    });
</script>